C++ Dsymbol::isAliasDeclaration方法代码示例

void AliasThis::semantic(Scope *sc)
{
    Dsymbol *p = sc->parent->pastMixin();
    AggregateDeclaration *ad = p->isAggregateDeclaration();
    if (!ad)
    {
        ::error(loc, "alias this can only be a member of aggregate, not %s %s",
            p->kind(), p->toChars());
        return;
    }

    assert(ad->members);
    Dsymbol *s = ad->search(loc, ident);
    if (!s)
    {
        s = sc->search(loc, ident, NULL);
        if (s)
            ::error(loc, "%s is not a member of %s", s->toChars(), ad->toChars());
        else
            ::error(loc, "undefined identifier %s", ident->toChars());
        return;
    }
    else if (ad->aliasthis && s != ad->aliasthis)
    {
        ::error(loc, "there can be only one alias this");
        return;
    }

    if (ad->type->ty == Tstruct && ((TypeStruct *)ad->type)->sym != ad)
    {
        AggregateDeclaration *ad2 = ((TypeStruct *)ad->type)->sym;
        assert(ad2->type == Type::terror);
        ad->aliasthis = ad2->aliasthis;
        return;
    }

    /* disable the alias this conversion so the implicit conversion check
     * doesn't use it.
     */
    ad->aliasthis = NULL;

    Dsymbol *sx = s;
    if (sx->isAliasDeclaration())
        sx = sx->toAlias();
    Declaration *d = sx->isDeclaration();
    if (d && !d->isTupleDeclaration())
    {
        Type *t = d->type;
        assert(t);
        if (ad->type->implicitConvTo(t) > MATCHnomatch)
        {
            ::error(loc, "alias this is not reachable as %s already converts to %s", ad->toChars(), t->toChars());
        }
    }

    ad->aliasthis = s;
}

void StructDeclaration::semantic(Scope *sc)
{
    Scope *sc2;

    //printf("+StructDeclaration::semantic(this=%p, %s '%s', sizeok = %d)\n", this, parent->toChars(), toChars(), sizeok);

    //static int count; if (++count == 20) halt();

    assert(type);
    if (!members)               // if opaque declaration
    {
        return;
    }

    if (symtab)
    {   if (sizeok == SIZEOKdone || !scope)
        {   //printf("already completed\n");
            scope = NULL;
            return;             // semantic() already completed
        }
    }
    else
        symtab = new DsymbolTable();

    Scope *scx = NULL;
    if (scope)
    {   sc = scope;
        scx = scope;            // save so we don't make redundant copies
        scope = NULL;
    }

    int errors = global.errors;

    unsigned dprogress_save = Module::dprogress;

    parent = sc->parent;
    type = type->semantic(loc, sc);
    handle = type;
    protection = sc->protection;
    alignment = sc->structalign;
    storage_class |= sc->stc;
    if (sc->stc & STCdeprecated)
        isdeprecated = true;
    assert(!isAnonymous());
    if (sc->stc & STCabstract)
        error("structs, unions cannot be abstract");
    userAttributes = sc->userAttributes;

    if (sizeok == SIZEOKnone)            // if not already done the addMember step
    {
        for (size_t i = 0; i < members->dim; i++)
        {
            Dsymbol *s = (*members)[i];
            //printf("adding member '%s' to '%s'\n", s->toChars(), this->toChars());
            s->addMember(sc, this, 1);
        }
    }

    sizeok = SIZEOKnone;
    sc2 = sc->push(this);
    sc2->stc &= STCsafe | STCtrusted | STCsystem;
    sc2->parent = this;
    if (isUnionDeclaration())
        sc2->inunion = 1;
    sc2->protection = PROTpublic;
    sc2->explicitProtection = 0;
    sc2->structalign = STRUCTALIGN_DEFAULT;
    sc2->userAttributes = NULL;

    /* Set scope so if there are forward references, we still might be able to
     * resolve individual members like enums.
     */
    for (size_t i = 0; i < members->dim; i++)
    {   Dsymbol *s = (*members)[i];
        /* There are problems doing this in the general case because
         * Scope keeps track of things like 'offset'
         */
        //if (s->isEnumDeclaration() || (s->isAggregateDeclaration() && s->ident))
        {
            //printf("struct: setScope %s %s\n", s->kind(), s->toChars());
            s->setScope(sc2);
        }
    }

    for (size_t i = 0; i < members->dim; i++)
    {
        Dsymbol *s = (*members)[i];

        /* If this is the last member, see if we can finish setting the size.
         * This could be much better - finish setting the size after the last
         * field was processed. The problem is the chicken-and-egg determination
         * of when that is. See Bugzilla 7426 for more info.
         */
        if (i + 1 == members->dim)
        {
            if (sizeok == SIZEOKnone && s->isAliasDeclaration())
                finalizeSize(sc2);
        }
        // Ungag errors when not speculative
        unsigned oldgag = global.gag;
//.........这里部分代码省略.........

Dsymbol *ScopeDsymbol::search(Loc loc, Identifier *ident, int flags)
{
    //printf("%s->ScopeDsymbol::search(ident='%s', flags=x%x)\n", toChars(), ident->toChars(), flags);
    //if (strcmp(ident->toChars(),"c") == 0) *(char*)0=0;

    // Look in symbols declared in this module
    Dsymbol *s = symtab ? symtab->lookup(ident) : NULL;
    //printf("\ts = %p, imports = %p, %d\n", s, imports, imports ? imports->dim : 0);

    // hide the aliases generated by selective or renamed private imports
    if (s && flags & 1)
        if (AliasDeclaration* ad = s->isAliasDeclaration())
            // may be a private alias to a function that is overloaded. these
            // are sorted out during overload resolution, accept them here
            if (ad->importprot == PROTprivate && !ad->aliassym->isFuncAliasDeclaration())
                s = NULL;

    if (s)
    {
        //printf("\ts = '%s.%s'\n",toChars(),s->toChars());
    }
    else if (imports)
    {
        // Look in imported modules
        for (size_t i = 0; i < imports->dim; i++)
        {   Dsymbol *ss = (*imports)[i];
            Dsymbol *s2;

            // If private import, don't search it
            if (flags & 1 && prots[i] == PROTprivate)
                continue;

            //printf("\tscanning import '%s', prots = %d, isModule = %p, isImport = %p\n", ss->toChars(), prots[i], ss->isModule(), ss->isImport());
            /* Don't find private members if ss is a module
             */
            s2 = ss->search(loc, ident, ss->isImport() ? 1 : 0);
            if (!s)
                s = s2;
            else if (s2 && s != s2)
            {
                if (s->toAlias() == s2->toAlias())
                {
                    /* After following aliases, we found the same symbol,
                     * so it's not an ambiguity.
                     * But if one alias is deprecated, prefer the other.
                     */
                    if (s->isDeprecated())
                        s = s2;
                }
                else
                {
                    /* Two imports of the same module should be regarded as
                     * the same.
                     */
                    Import *i1 = s->isImport();
                    Import *i2 = s2->isImport();
                    if (!(i1 && i2 &&
                          (i1->mod == i2->mod ||
                           (!i1->parent->isImport() && !i2->parent->isImport() &&
                            i1->ident->equals(i2->ident))
                          )
                         )
                       )
                    {
                        ScopeDsymbol::multiplyDefined(loc, s, s2);
                        break;
                    }
                }
            }
        }
        if (s)
        {
            Declaration *d = s->isDeclaration();
            if (d && d->protection == PROTprivate &&
                !d->parent->isTemplateMixin())
                error(loc, "%s is private", d->toPrettyChars());
        }
    }
    return s;
}

//.........这里部分代码省略.........
            sc->linkage = LINKc;
    }
    sc->protection = PROTpublic;
    sc->explicitProtection = 0;
    sc->structalign = STRUCTALIGN_DEFAULT;
    if (baseClass)
    {   sc->offset = baseClass->structsize;
        alignsize = baseClass->alignsize;
//      if (enclosing)
//          sc->offset += Target::ptrsize;      // room for uplevel context pointer
    }
    else
    {   sc->offset = Target::ptrsize * 2;       // allow room for __vptr and __monitor
        alignsize = Target::ptrsize;
    }
    sc->userAttributes = NULL;
    structsize = sc->offset;
    Scope scsave = *sc;
    size_t members_dim = members->dim;
    sizeok = SIZEOKnone;

    /* Set scope so if there are forward references, we still might be able to
     * resolve individual members like enums.
     */
    for (size_t i = 0; i < members_dim; i++)
    {   Dsymbol *s = (*members)[i];
        /* There are problems doing this in the general case because
         * Scope keeps track of things like 'offset'
         */
        if (s->isEnumDeclaration() ||
            (s->isAggregateDeclaration() && s->ident) ||
            s->isTemplateMixin() ||
            s->isAttribDeclaration() ||
            s->isAliasDeclaration())
        {
            //printf("[%d] setScope %s %s, sc = %p\n", i, s->kind(), s->toChars(), sc);
            s->setScope(sc);
        }
    }

    for (size_t i = 0; i < members_dim; i++)
    {   Dsymbol *s = (*members)[i];
        s->semantic(sc);
    }

    // Set the offsets of the fields and determine the size of the class

    unsigned offset = structsize;
    bool isunion = isUnionDeclaration() != NULL;
    for (size_t i = 0; i < members->dim; i++)
    {   Dsymbol *s = (*members)[i];
        s->setFieldOffset(this, &offset, false);
    }
    sc->offset = structsize;

    if (global.errors != errors)
    {   // The type is no good.
        type = Type::terror;
    }

    if (sizeok == SIZEOKfwd)            // failed due to forward references
    {   // semantic() failed due to forward references
        // Unwind what we did, and defer it for later

        for (size_t i = 0; i < fields.dim; i++)
        {   Dsymbol *s = fields[i];

void StructDeclaration::semantic(Scope *sc)
{
    Scope *sc2;

    //printf("+StructDeclaration::semantic(this=%p, %s '%s', sizeok = %d)\n", this, parent->toChars(), toChars(), sizeok);

    //static int count; if (++count == 20) halt();

    assert(type);
    if (!members)               // if opaque declaration
    {
        return;
    }

    if (symtab)
    {   if (sizeok == SIZEOKdone || !scope)
        {   //printf("already completed\n");
            scope = NULL;
            return;             // semantic() already completed
        }
    }
    else
        symtab = new DsymbolTable();

    Scope *scx = NULL;
    if (scope)
    {
        sc = scope;
        scx = scope;            // save so we don't make redundant copies
        scope = NULL;
    }
    unsigned dprogress_save = Module::dprogress;
    int errors = global.errors;

    parent = sc->parent;
    type = type->semantic(loc, sc);
    handle = type;
    protection = sc->protection;
    alignment = sc->structalign;
    storage_class |= sc->stc;
    if (sc->stc & STCdeprecated)
        isdeprecated = true;
    assert(!isAnonymous());
    if (sc->stc & STCabstract)
        error("structs, unions cannot be abstract");
    userAttributes = sc->userAttributes;

    if (sizeok == SIZEOKnone)            // if not already done the addMember step
    {
        for (size_t i = 0; i < members->dim; i++)
        {
            Dsymbol *s = (*members)[i];
            //printf("adding member '%s' to '%s'\n", s->toChars(), this->toChars());
            s->addMember(sc, this, 1);
        }
    }

    sizeok = SIZEOKnone;
    sc2 = sc->push(this);
    sc2->stc &= STCsafe | STCtrusted | STCsystem;
    sc2->parent = this;
    if (isUnionDeclaration())
        sc2->inunion = 1;
    sc2->protection = PROTpublic;
    sc2->explicitProtection = 0;
    sc2->structalign = STRUCTALIGN_DEFAULT;
    sc2->userAttributes = NULL;

    /* Set scope so if there are forward references, we still might be able to
     * resolve individual members like enums.
     */
    for (size_t i = 0; i < members->dim; i++)
    {
        Dsymbol *s = (*members)[i];
        //printf("struct: setScope %s %s\n", s->kind(), s->toChars());
        s->setScope(sc2);
    }

    for (size_t i = 0; i < members->dim; i++)
    {
        Dsymbol *s = (*members)[i];

        /* If this is the last member, see if we can finish setting the size.
         * This could be much better - finish setting the size after the last
         * field was processed. The problem is the chicken-and-egg determination
         * of when that is. See Bugzilla 7426 for more info.
         */
        if (i + 1 == members->dim)
        {
            if (sizeok == SIZEOKnone && s->isAliasDeclaration())
                finalizeSize(sc2);
        }

        // Ungag errors when not speculative
        Ungag ungag = ungagSpeculative();
        s->semantic(sc2);
    }
    finalizeSize(sc2);

    if (sizeok == SIZEOKfwd)
//.........这里部分代码省略.........

void Import::load(Scope *sc)
{
    //printf("Import::load('%s') %p\n", toPrettyChars(), this);

    // See if existing module
    DsymbolTable *dst = Package::resolve(packages, NULL, &pkg);
#if 0
    if (pkg && pkg->isModule())
    {
        ::error(loc, "can only import from a module, not from a member of module %s. Did you mean `import %s : %s`?",
             pkg->toChars(), pkg->toPrettyChars(), id->toChars());
        mod = pkg->isModule(); // Error recovery - treat as import of that module
        return;
    }
#endif
    Dsymbol *s = dst->lookup(id);
    if (s)
    {
        if (s->isModule())
            mod = (Module *)s;
        else
        {
            if (s->isAliasDeclaration())
            {
                ::error(loc, "%s %s conflicts with %s", s->kind(), s->toPrettyChars(), id->toChars());
            }
            else if (Package *p = s->isPackage())
            {
                if (p->isPkgMod == PKGunknown)
                {
                    mod = Module::load(loc, packages, id);
                    if (!mod)
                        p->isPkgMod = PKGpackage;
                    else
                        assert(p->isPkgMod == PKGmodule);
                }
                else
                {
                    mod = p->isPackageMod();
                }
                if (!mod)
                {
                    ::error(loc, "can only import from a module, not from package %s.%s",
                        p->toPrettyChars(), id->toChars());
                }
            }
            else if (pkg)
            {
                ::error(loc, "can only import from a module, not from package %s.%s",
                    pkg->toPrettyChars(), id->toChars());
            }
            else
            {
                ::error(loc, "can only import from a module, not from package %s",
                    id->toChars());
            }
        }
    }

    if (!mod)
    {
        // Load module
        mod = Module::load(loc, packages, id);
        if (mod)
        {
            dst->insert(id, mod);           // id may be different from mod->ident,
                                            // if so then insert alias
        }
    }
    if (mod && !mod->importedFrom)
        mod->importedFrom = sc ? sc->module->importedFrom : Module::rootModule;
    if (!pkg)
        pkg = mod;

    //printf("-Import::load('%s'), pkg = %p\n", toChars(), pkg);
}

//.........这里部分代码省略.........
        sc2->inunion = 1;
    sc2->protection = Prot(PROTpublic);
    sc2->explicitProtection = 0;
    sc2->structalign = STRUCTALIGN_DEFAULT;
    sc2->userAttribDecl = NULL;

    /* Set scope so if there are forward references, we still might be able to
     * resolve individual members like enums.
     */
    for (size_t i = 0; i < members->dim; i++)
    {
        Dsymbol *s = (*members)[i];
        //printf("struct: setScope %s %s\n", s->kind(), s->toChars());
        s->setScope(sc2);
    }

    for (size_t i = 0; i < members->dim; i++)
    {
        Dsymbol *s = (*members)[i];
        s->importAll(sc2);
    }

    for (size_t i = 0; i < members->dim; i++)
    {
        Dsymbol *s = (*members)[i];

        /* If this is the last member, see if we can finish setting the size.
         * This could be much better - finish setting the size after the last
         * field was processed. The problem is the chicken-and-egg determination
         * of when that is. See Bugzilla 7426 for more info.
         */
        if (i + 1 == members->dim)
        {
            if (sizeok == SIZEOKnone && s->isAliasDeclaration())
                finalizeSize(sc2);
        }
        s->semantic(sc2);
    }
    finalizeSize(sc2);

    if (sizeok == SIZEOKfwd)
    {
        // semantic() failed because of forward references.
        // Unwind what we did, and defer it for later
        for (size_t i = 0; i < fields.dim; i++)
        {
            VarDeclaration *vd = fields[i];
            vd->offset = 0;
        }
        fields.setDim(0);
        structsize = 0;
        alignsize = 0;

        scope = scx ? scx : sc->copy();
        scope->setNoFree();
        scope->module->addDeferredSemantic(this);

        Module::dprogress = dprogress_save;
        //printf("\tdeferring %s\n", toChars());
        return;
    }

    Module::dprogress++;
    semanticRun = PASSsemanticdone;

    //printf("-StructDeclaration::semantic(this=%p, '%s')\n", this, toChars());

//.........这里部分代码省略.........
    if (isUnionDeclaration())
        sc2->inunion = 1;
    sc2->protection = PROTpublic;
    sc2->explicitProtection = 0;

    size_t members_dim = members->dim;

    /* Set scope so if there are forward references, we still might be able to
     * resolve individual members like enums.
     */
    for (size_t i = 0; i < members_dim; i++)
    {   Dsymbol *s = (*members)[i];
        /* There are problems doing this in the general case because
         * Scope keeps track of things like 'offset'
         */
        if (s->isEnumDeclaration() || (s->isAggregateDeclaration() && s->ident))
        {
            //printf("setScope %s %s\n", s->kind(), s->toChars());
            s->setScope(sc2);
        }
    }

    for (size_t i = 0; i < members_dim; i++)
    {
        Dsymbol *s = (*members)[i];

        /* If this is the last member, see if we can finish setting the size.
         * This could be much better - finish setting the size after the last
         * field was processed. The problem is the chicken-and-egg determination
         * of when that is. See Bugzilla 7426 for more info.
         */
        if (i + 1 == members_dim)
        {
            if (sizeok == 0 && s->isAliasDeclaration())
                finalizeSize();
        }
        // Ungag errors when not speculative
        unsigned oldgag = global.gag;
        if (global.isSpeculativeGagging() && !isSpeculative())
            global.gag = 0;
        s->semantic(sc2);
        global.gag = oldgag;
    }

    if (sizeok == 2)
    {   // semantic() failed because of forward references.
        // Unwind what we did, and defer it for later
        fields.setDim(0);
        structsize = 0;
        alignsize = 0;
        structalign = 0;

        scope = scx ? scx : new Scope(*sc);
        scope->setNoFree();
        scope->module->addDeferredSemantic(this);

        Module::dprogress = dprogress_save;
        //printf("\tdeferring %s\n", toChars());
        return;
    }

    finalizeSize();
    Module::dprogress++;

    //printf("-StructDeclaration::semantic(this=%p, '%s')\n", this, toChars());